The Cowboys are the NFL's most valuable team -- How much are they worth?

Not only are the Dallas Cowboys the NFL's most valuable team...according to Forbes they are now the most valuable franchise in sports.

Forbes' NFL valuations show the Cowboys worth $4.2 billion, easily topping the league for the 10th straight year. Next closest are the New England Patriots at $3.4 billion.

Earlier this year, Forbes cited Jerry Jones' team as the world's most valuable franchise.

Dallas has $700 million in revenues and $300 million in operating income.

The average NFL team is worth $2.34 billion, a 19 percent increase over last year. That increase is primarily due to more rights fees for Thursday night games, the Rams' relocation from St. Louis to Los Angeles, the Vikings moving into their new stadium in Minneapolis and the Atlanta Falcons nearing completion of their new stadium.

Stan Kroenke's Rams made the biggest change in value, up 100 percent.

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The New York Giants ($3.1 billion), San Francisco 49ers ($3.0 billion) and Washington Redskins ($2.95 billion) round out Forbes' top five.